Beyond the file name wowscrnshot_031209_0109051.jpg I am unable to prove that I took that screenshot today. Yes in March, months and months after Halloween.
How do I still have a broomstick?
I must have logged out while on it during Halloween festivitys, and I did not log that toon for a long time. ( She was supposed to be my banker alt, but I had ended up buying a guild to use as my bank) So I log into her tonite, and find that she still is on her broom. The broom is missing from her inventory, but she is still on it so it can still be seen, and ridden all around. The moment I go indoors I am sure I will lose it, so I am going to keep her like that and ride around stormwind every now and then causing amazment and wonder and lots of questions of ” Where did you get that?”
Provided by 
Pugnacious Priest's Warcraft Blog 
You could wait until the next seasonal holiday (noblesgarden?) and take a screenshot of yourself with holiday decorations or with a NPC.
Oh – Yes.. that will be soon – ! Will repost with eastereggs :P.